US20150240805A1 - High-Pressure Pump for Use in a High-Pressure Press - Google Patents
High-Pressure Pump for Use in a High-Pressure Press Download PDFInfo
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- US20150240805A1 US20150240805A1 US14/188,805 US201414188805A US2015240805A1 US 20150240805 A1 US20150240805 A1 US 20150240805A1 US 201414188805 A US201414188805 A US 201414188805A US 2015240805 A1 US2015240805 A1 US 2015240805A1
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- pressure
- rotary shaft
- pressure pump
- partition
- pump
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C2/00—Rotary-piston machines or pumps
- F04C2/08—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
- F04C2/082—Details specially related to intermeshing engagement type machines or pumps
- F04C2/084—Toothed wheels
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J3/00—Processes of utilising sub-atmospheric or super-atmospheric pressure to effect chemical or physical change of matter; Apparatus therefor
- B01J3/06—Processes using ultra-high pressure, e.g. for the formation of diamonds; Apparatus therefor, e.g. moulds or dies
- B01J3/065—Presses for the formation of diamonds or boronitrides
- B01J3/067—Presses using a plurality of pressing members working in different directions
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B30—PRESSES
- B30B—PRESSES IN GENERAL
- B30B1/00—Presses, using a press ram, characterised by the features of the drive therefor, pressure being transmitted directly, or through simple thrust or tension members only, to the press ram or platen
- B30B1/003—Presses, using a press ram, characterised by the features of the drive therefor, pressure being transmitted directly, or through simple thrust or tension members only, to the press ram or platen by an elastic bag or diaphragm expanded by fluid pressure
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B30—PRESSES
- B30B—PRESSES IN GENERAL
- B30B11/00—Presses specially adapted for forming shaped articles from material in particulate or plastic state, e.g. briquetting presses, tabletting presses
- B30B11/005—Control arrangements
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B30—PRESSES
- B30B—PRESSES IN GENERAL
- B30B11/00—Presses specially adapted for forming shaped articles from material in particulate or plastic state, e.g. briquetting presses, tabletting presses
- B30B11/007—Presses specially adapted for forming shaped articles from material in particulate or plastic state, e.g. briquetting presses, tabletting presses using a plurality of pressing members working in different directions
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C11/00—Combinations of two or more machines or pumps, each being of rotary-piston or oscillating-piston type; Pumping installations
- F04C11/001—Combinations of two or more machines or pumps, each being of rotary-piston or oscillating-piston type; Pumping installations of similar working principle
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C2/00—Rotary-piston machines or pumps
- F04C2/08—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
- F04C2/12—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type
- F04C2/14—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type with toothed rotary pistons
- F04C2/18—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type with toothed rotary pistons with similar tooth forms
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C15/00—Component parts, details or accessories of machines, pumps or pumping installations, not provided for in groups F04C2/00 - F04C14/00
- F04C15/0057—Driving elements, brakes, couplings, transmission specially adapted for machines or pumps
- F04C15/0061—Means for transmitting movement from the prime mover to driven parts of the pump, e.g. clutches, couplings, transmissions
- F04C15/0073—Couplings between rotors and input or output shafts acting by interengaging or mating parts, i.e. positive coupling of rotor and shaft
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C2240/00—Components
- F04C2240/70—Use of multiplicity of similar components; Modular construction
Definitions
- the present invention relates generally to high-pressure pumps as are common in applications that use a high-pressure, high-temperature press, such as the manufacture of polycrystalline diamonds. More particularly, the present invention relates to high-pressure pumps that comprise a plurality of positive displacement pumps that are stacked to increase the overall pressure differential capabilities of the high-pressure pump. For example, a positive displacement pump may be able to generate only a limited pressure differential; when a higher pressure differential is desired, additional positive displacement pumps may be stacked to increase the overall pressure differential without exceeding the maximum allowable pressure differential across any solitary positive displacement pump.
- Rotary gear pumps are well known types of positive displacement pumps employed to pump fluids from one location to another.
- Rotary gear pumps conventionally employ two gears having meshing teeth disposed within a housing to deliver fluid entering the housing from an inlet to an outlet.
- One of the toothed gears may be a drive gear rotated by a motor or other suitable means while the other gear may be a driven gear which is driven by the drive gear.
- An example of such a rotary gear pump can be found in U.S. Pat. No. 6,123,533 to McBurnett which discloses a positive displacement pump including a drive gear meshed with an idler gear.
- only a limited pressure differential may be able to be generated across such a rotary gear pump.
- U.S. Pat. No. 6,666,666 to Gilbert discloses a pump comprising multiple, axially stacked positive displacement pumps.
- the stacked pumps are arranged within an outer retaining barrel in one or more stages.
- Drive and idler shafts extend axially through each stacked component.
- the entire stack of sections and crossovers between stages can be fit into the bore of a tubular barrel, compressed sealably together and retained therein.
- the pressure differential may cause the shafts used to drive the rotors to be displaced.
- an elongated casing may comprise a hollow interior formed along a central axis. At least one partition may be axially fixed within the elongated casing such that it divides the hollow interior. This may be accomplished by a variety of methods. In one method, the at least one partition comprises an expandable exterior surface that may remain retracted during insertion into the hollow interior of the elongated casing and then expand to fix the at least one partition to the casing. In other methods, the at least one partition may be axially fixed to the elongated casing by a locking element extending through an exterior of the elongated casing.
- First and second pressure differential devices may be disposed on opposite sides of the at least one partition and each have a rotary shaft extending there through.
- a first rotary shaft extending through the first pressure differential device may be axially fixed by the at least one partition. This may be accomplished by a variety of methods.
- the first rotary shaft comprises at least one appendage protruding there from such that the appendage is axially constrained by the partition.
- a thrust bearing may also be disposed between the appendage and the partition.
- the first rotary shaft may also be rotationally fixed to a second rotary shaft extending through the second pressure differential device. This may be accomplished by a variety of methods.
- One method may comprise a male spline end on the first rotary shaft mating with a female spline end on the second rotary shaft.
- An alternative method may comprise the first and second rotary shafts mating through a coupling.
- the first rotary shaft drives a first parallel rotary shaft also extending through the first pressure differential device.
- the first parallel rotary shaft may also be axially fixed by the at least one partition. This may be accomplished by at least one appendage protruding from the first parallel rotary shaft and axially constrained by the partition. It may be necessary to offset the appendage of the first parallel rotary shaft from the appendage of the first rotary shaft.
- the first parallel rotary shaft may also be rotationally fixed to a second parallel rotary shaft extending through the second pressure differential device.
- the first and second pressure differential devices may each comprise either a solitary positive displacement gear pump or a plurality of positive displacement gear pumps. Fluid may pass from the first pressure differential device to the second pressure differential device through a channel in the at least one partition.
- the first and second pressure differential devices may be axially fixed within the elongated casing. At least one pressure transducer may extend through the elongated casing into the hollow interior.
- the first rotary shaft may be connected to and driven by a servomotor.
- a high-pressure press may comprise a piston enclosing an expandable cavity.
- a bi-directional high-pressure pump may fluidly connect the expandable cavity to a reservoir.
- the bi-directional high-pressure pump may be capable of feeding fluid to the expandable cavity from the reservoir and also withdrawing fluid from the expandable cavity back to the reservoir.
- a servomotor may be used to control the bi-directional high-pressure pump.
- the bi-directional high-pressure pump may comprise a first rotary shaft axially fixed to a casing and rotationally fixed to a second rotary shaft. This may allow for a stack of pressure differential devices to build up pressure in the bi-directional high-pressure pump while preventing axial displacement of the rotary shafts.
- the high-pressure press may comprise a position transducer to identify the position of the piston or a pressure transducer to identify a pressure in the expandable cavity.
- a controller may receive input from the piston position transducer or expandable cavity pressure transducer to control the servomotor.
- the high-pressure press may comprise a plurality of pistons operated simultaneously to compress a single chamber.
- FIG. 1 is a diagram of an embodiment of a high-pressure press comprising bi-directional high-pressure pumps fluidly connecting a reservoir to expandable cavities of several pistons.
- FIG. 2 is a diagram of an embodiment of a high-pressure press comprising a bi-directional pump controlled by a servomotor.
- FIG. 3 is a perspective view of an embodiment of a positive displacement gear pump.
- FIG. 4 is a perspective view of an embodiment of a pressure differential device comprising a plurality of positive displacement gear pumps.
- FIG. 5 is a longitudinal section view of an embodiment of a high-pressure pump.
- FIG. 6 is a magnified longitudinal section view of an embodiment of a high-pressure pump.
- FIG. 7 a is a perspective view of a first rotary shaft, a second rotary shaft and a coupling.
- FIG. 7 b is a perspective view of an embodiment of a first rotary shaft comprising a male spline end and a second rotary shaft comprising a female spline end.
- FIG. 8 is a longitudinal section view of an embodiment of a high-pressure pump comprising a pressure transducer.
- FIG. 9 is a longitudinal section view of an embodiment of a high-pressure pump comprising locking elements extending through a casing.
- FIG. 1 is a diagram of an embodiment of a high-pressure press 100 such as may be used to manufacture polycrystalline diamonds.
- diamond grains may be mixed with catalyst, disposed in a canister and pressed under high pressure which allows for crystalline formation to sinter the grains together.
- canisters may disposed within a cube 110 placed between a plurality of pistons 120 .
- Each of the plurality of pistons 120 may enclose an expandable cavity 130 .
- Bi-directional high-pressure pumps 140 may port fluid back and forth between a reservoir 150 and each expandable cavity 130 to accurately extend and retract the plurality of pistons 120 , thus applying pressure to cube 110 .
- FIG. 2 is a diagram of another embodiment of a high-pressure press 200 .
- a servomotor 260 may provide precise control for a bi-directional high-pressure pump 240 that may port fluid back and forth between a reservoir 250 and an expandable cavity 230 of a piston 220 .
- the servomotor 260 may receive feedback from either a position transducer 270 (such as a linear variable differential transformer) identifying a position of the piston 220 or a pressure transducer 280 identifying a pressure in the expandable cavity 230 .
- a position transducer 270 such as a linear variable differential transformer
- the servomotor 260 may receive a feedback signal to operate the bi-directional high-pressure pump 240 to move fluid to pressurize the piston 220 .
- the servomotor 260 may receive a feedback signal to operate the bi-directional high-pressure pump 240 to move fluid to reposition the piston 220 .
- this servomotor 260 may be shut off if the pressure is to be held constant.
- FIG. 3 shows an embodiment of a positive displacement gear pump 300 .
- the positive displacement gear pump 300 may comprise a substantially cylindrical body 310 comprising a fluid inlet 320 and a fluid outlet 330 .
- the fluid inlet 320 and fluid outlet 330 may be separated by a gear chamber 340 in which a pair of complementary gears 350 may be disposed.
- the pair of complementary gears 350 may prevent fluid from passing through the gear chamber 340 from the fluid inlet 320 to the fluid outlet 330 .
- the pair of complementary gears 350 may comprise a drive gear 355 and a driven gear 356 , such that the driven gear 356 rotates in a direction opposite to the direction of rotation of the drive gear 355 .
- the pair of complementary gears 350 may be formed in any practical manner and from any convenient material known to persons skilled in the art, e.g. such as those used in conventional hydraulic gear pumps. Various modifications to provide deviations from ordinary tooth profiles may be made to obtain a higher efficiency and reduced pressure pulses and noise.
- the positive displacement gear pump 300 may be bi-directional.
- FIG. 4 shows an embodiment of a pressure differential device 400 comprising a plurality of stacked positive displacement gear pumps 403 .
- Each of the plurality of stacked positive displacement gear pumps 403 may create a pressure differential there across.
- the pressure differentials across each of the plurality of stacked positive displacement gear pumps 403 may add to the total pressure differential attainable across the pressure differential device 400 .
- the pressure differential device 400 may further comprise a drive shaft 455 and a driven shaft 456 extending there through, parallel to a central axis thereof.
- the drive shaft 455 may rotate a plurality of drive gears (hidden) within each of the plurality of stacked positive displacement gear pumps 403 which may each be rotating driven gears (hidden) that together rotate the driven shaft 456 .
- FIG. 5 shows an embodiment of a high-pressure pump 500 comprising a plurality of pressure differential devices 504 disposed within an elongated casing 510 .
- the elongated casing 510 may comprise a substantially hollow interior 515 formed along a central axis thereof.
- At least one partition 520 may be axially fixed within the elongated casing 510 such that it divides the hollow interior 515 . This may be accomplished, in various embodiments, by threading the at least one partition 520 within the hollow interior 515 or inserting the at least one partition 520 into the hollow interior 515 and then expanding an exterior surface thereof
- First and second pressure differential devices, 525 and 526 respectively, may be disposed on opposite sides of the at least one partition 520 .
- a first rotary shaft 555 may extend through the first pressure differential device 525 and be axially fixed by the at least one partition 520 .
- the first rotary shaft 555 may also be rotationally fixed with a second rotary shaft 556 extending through the second pressure differential device 526 .
- the first rotary shaft 555 drives a first parallel rotary shaft 565 also extending through the first pressure differential device 525 .
- the first parallel rotary shaft 565 may also be axially fixed by the at least one partition 520 and rotationally fixed to a second parallel rotary shaft 566 extending through the second pressure differential device 526 .
- This configuration may be desirable because the overall pressure differential across the high-pressure pump 500 is sustained by the casing 510 .
- Each rotary shaft only bears the pressure associated with its corresponding pressure differential device. This allows extremely high pressure differentials to be achieved, as the casing 510 may be capable of withstanding higher pressures than any rotary shaft is able to withstand.
- FIG. 6 shows a magnified view of a partition 620 axially fixed within an elongated casing 610 of a high-pressure pump 600 .
- a first rotary shaft 655 may comprise at least one appendage 658 protruding therefrom.
- the at least one appendage 658 may be axially confined by the at least one partition 620 aided by a thrust bearing 659 .
- the first rotary shaft 655 drives a first parallel rotary shaft 665 .
- the first parallel rotary shaft 665 may also comprise at least one appendage 668 that is axially confined by the at least one partition 620 aided by a thrust bearing 669 .
- FIGS. 7 a and 7 b show embodiments of various shaft connection assemblies that may allow for rotational fixation without axial fixation. These types of connections may allow for torque to be transferred without transferring axial thrust.
- FIG. 7 a shows first and second rotary shafts, 710 a and 720 a respectively, both comprising male spline ends that may mate with a female spline coupling 730 a .
- FIG. 7 b shows a first rotary shaft 710 b comprising a male spline end that may mate with a second rotary shaft 720 b comprising a female spline end.
Abstract
Description
- This patent application claims priority to U.S. Provisional Pat. App. Nos. 61/769,602, filed on Feb. 26, 2013, and 61/772,757, filed on Mar. 5, 2013, which are incorporated herein by reference for all that they contain.
- The present invention relates generally to high-pressure pumps as are common in applications that use a high-pressure, high-temperature press, such as the manufacture of polycrystalline diamonds. More particularly, the present invention relates to high-pressure pumps that comprise a plurality of positive displacement pumps that are stacked to increase the overall pressure differential capabilities of the high-pressure pump. For example, a positive displacement pump may be able to generate only a limited pressure differential; when a higher pressure differential is desired, additional positive displacement pumps may be stacked to increase the overall pressure differential without exceeding the maximum allowable pressure differential across any solitary positive displacement pump.
- Rotary gear pumps are well known types of positive displacement pumps employed to pump fluids from one location to another. Rotary gear pumps conventionally employ two gears having meshing teeth disposed within a housing to deliver fluid entering the housing from an inlet to an outlet. One of the toothed gears may be a drive gear rotated by a motor or other suitable means while the other gear may be a driven gear which is driven by the drive gear. An example of such a rotary gear pump can be found in U.S. Pat. No. 6,123,533 to McBurnett which discloses a positive displacement pump including a drive gear meshed with an idler gear. However, only a limited pressure differential may be able to be generated across such a rotary gear pump.
- It may be desirable to combine two or more such positive displacement pumps together, creating a multi-stage operation, to increase the final discharge pressure. U.S. Pat. No. 6,666,666 to Gilbert discloses a pump comprising multiple, axially stacked positive displacement pumps. The stacked pumps are arranged within an outer retaining barrel in one or more stages. Drive and idler shafts extend axially through each stacked component. The entire stack of sections and crossovers between stages can be fit into the bore of a tubular barrel, compressed sealably together and retained therein. However, when generating extremely high pressure differentials in a particular stacked section, the pressure differential may cause the shafts used to drive the rotors to be displaced.
- In one aspect of the present invention, an elongated casing may comprise a hollow interior formed along a central axis. At least one partition may be axially fixed within the elongated casing such that it divides the hollow interior. This may be accomplished by a variety of methods. In one method, the at least one partition comprises an expandable exterior surface that may remain retracted during insertion into the hollow interior of the elongated casing and then expand to fix the at least one partition to the casing. In other methods, the at least one partition may be axially fixed to the elongated casing by a locking element extending through an exterior of the elongated casing.
- First and second pressure differential devices may be disposed on opposite sides of the at least one partition and each have a rotary shaft extending there through. A first rotary shaft extending through the first pressure differential device may be axially fixed by the at least one partition. This may be accomplished by a variety of methods. In one method, the first rotary shaft comprises at least one appendage protruding there from such that the appendage is axially constrained by the partition. A thrust bearing may also be disposed between the appendage and the partition.
- The first rotary shaft may also be rotationally fixed to a second rotary shaft extending through the second pressure differential device. This may be accomplished by a variety of methods. One method may comprise a male spline end on the first rotary shaft mating with a female spline end on the second rotary shaft. An alternative method may comprise the first and second rotary shafts mating through a coupling.
- In some embodiments, the first rotary shaft drives a first parallel rotary shaft also extending through the first pressure differential device. The first parallel rotary shaft may also be axially fixed by the at least one partition. This may be accomplished by at least one appendage protruding from the first parallel rotary shaft and axially constrained by the partition. It may be necessary to offset the appendage of the first parallel rotary shaft from the appendage of the first rotary shaft. The first parallel rotary shaft may also be rotationally fixed to a second parallel rotary shaft extending through the second pressure differential device.
- In various embodiments, the first and second pressure differential devices may each comprise either a solitary positive displacement gear pump or a plurality of positive displacement gear pumps. Fluid may pass from the first pressure differential device to the second pressure differential device through a channel in the at least one partition. The first and second pressure differential devices may be axially fixed within the elongated casing. At least one pressure transducer may extend through the elongated casing into the hollow interior. In some embodiments, the first rotary shaft may be connected to and driven by a servomotor.
- In another aspect of the present invention, a high-pressure press may comprise a piston enclosing an expandable cavity. A bi-directional high-pressure pump may fluidly connect the expandable cavity to a reservoir. The bi-directional high-pressure pump may be capable of feeding fluid to the expandable cavity from the reservoir and also withdrawing fluid from the expandable cavity back to the reservoir. A servomotor may be used to control the bi-directional high-pressure pump. The bi-directional high-pressure pump may comprise a first rotary shaft axially fixed to a casing and rotationally fixed to a second rotary shaft. This may allow for a stack of pressure differential devices to build up pressure in the bi-directional high-pressure pump while preventing axial displacement of the rotary shafts.
- In various embodiments, the high-pressure press may comprise a position transducer to identify the position of the piston or a pressure transducer to identify a pressure in the expandable cavity. A controller may receive input from the piston position transducer or expandable cavity pressure transducer to control the servomotor. In some embodiments, the high-pressure press may comprise a plurality of pistons operated simultaneously to compress a single chamber.
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FIG. 1 is a diagram of an embodiment of a high-pressure press comprising bi-directional high-pressure pumps fluidly connecting a reservoir to expandable cavities of several pistons. -
FIG. 2 is a diagram of an embodiment of a high-pressure press comprising a bi-directional pump controlled by a servomotor. -
FIG. 3 is a perspective view of an embodiment of a positive displacement gear pump. -
FIG. 4 is a perspective view of an embodiment of a pressure differential device comprising a plurality of positive displacement gear pumps. -
FIG. 5 is a longitudinal section view of an embodiment of a high-pressure pump. -
FIG. 6 is a magnified longitudinal section view of an embodiment of a high-pressure pump. -
FIG. 7 a is a perspective view of a first rotary shaft, a second rotary shaft and a coupling. -
FIG. 7 b is a perspective view of an embodiment of a first rotary shaft comprising a male spline end and a second rotary shaft comprising a female spline end. -
FIG. 8 is a longitudinal section view of an embodiment of a high-pressure pump comprising a pressure transducer. -
FIG. 9 is a longitudinal section view of an embodiment of a high-pressure pump comprising locking elements extending through a casing. - Referring now to the figures,
FIG. 1 is a diagram of an embodiment of a high-pressure press 100 such as may be used to manufacture polycrystalline diamonds. In such operations, diamond grains may be mixed with catalyst, disposed in a canister and pressed under high pressure which allows for crystalline formation to sinter the grains together. Several canisters may disposed within acube 110 placed between a plurality ofpistons 120. Each of the plurality ofpistons 120 may enclose anexpandable cavity 130. Bi-directional high-pressure pumps 140 may port fluid back and forth between areservoir 150 and eachexpandable cavity 130 to accurately extend and retract the plurality ofpistons 120, thus applying pressure tocube 110. -
FIG. 2 is a diagram of another embodiment of a high-pressure press 200. Aservomotor 260 may provide precise control for a bi-directional high-pressure pump 240 that may port fluid back and forth between areservoir 250 and anexpandable cavity 230 of apiston 220. In various embodiments, theservomotor 260 may receive feedback from either a position transducer 270 (such as a linear variable differential transformer) identifying a position of thepiston 220 or apressure transducer 280 identifying a pressure in theexpandable cavity 230. - In practice, if the
pressure transducer 270 measures a deficiency in pressure in theexpandable cavity 230, theservomotor 260 may receive a feedback signal to operate the bi-directional high-pressure pump 240 to move fluid to pressurize thepiston 220. Alternatively, if theposition transducer 270 measures an undesirable position for thepiston 220, theservomotor 260 may receive a feedback signal to operate the bi-directional high-pressure pump 240 to move fluid to reposition thepiston 220. Unlike prior art systems that require a perpetually running motor to maintain fluid pressure, thisservomotor 260 may be shut off if the pressure is to be held constant. -
FIG. 3 shows an embodiment of a positivedisplacement gear pump 300. The positivedisplacement gear pump 300 may comprise a substantiallycylindrical body 310 comprising afluid inlet 320 and afluid outlet 330. Thefluid inlet 320 andfluid outlet 330 may be separated by agear chamber 340 in which a pair ofcomplementary gears 350 may be disposed. The pair ofcomplementary gears 350 may prevent fluid from passing through thegear chamber 340 from thefluid inlet 320 to thefluid outlet 330. The pair ofcomplementary gears 350 may comprise adrive gear 355 and a drivengear 356, such that the drivengear 356 rotates in a direction opposite to the direction of rotation of thedrive gear 355. - When the
drive gear 355 is actuated, a fixed amount of fluid is transported from thefluid inlet 320 to thefluid outlet 330 according to the rotation of thedrive gear 355 and the drivengear 356. The pair ofcomplementary gears 350 may be formed in any practical manner and from any convenient material known to persons skilled in the art, e.g. such as those used in conventional hydraulic gear pumps. Various modifications to provide deviations from ordinary tooth profiles may be made to obtain a higher efficiency and reduced pressure pulses and noise. - When the
drive gear 355 is rotated in a reverse direction, fluid is transferred from thefluid outlet 330 to thefluid inlet 320. Thus the positivedisplacement gear pump 300 may be bi-directional. -
FIG. 4 shows an embodiment of a pressuredifferential device 400 comprising a plurality of stacked positive displacement gear pumps 403. Each of the plurality of stacked positive displacement gear pumps 403 may create a pressure differential there across. The pressure differentials across each of the plurality of stacked positive displacement gear pumps 403 may add to the total pressure differential attainable across the pressuredifferential device 400. The pressuredifferential device 400 may further comprise adrive shaft 455 and a drivenshaft 456 extending there through, parallel to a central axis thereof. Thedrive shaft 455 may rotate a plurality of drive gears (hidden) within each of the plurality of stacked positive displacement gear pumps 403 which may each be rotating driven gears (hidden) that together rotate the drivenshaft 456. - As the total pressure differential attainable across the pressure
differential device 400 increases, so does the force required to hold the plurality of stacked positive displacement gear pumps 403 together and to keep thedrive shaft 455 and drivenshaft 456 axially constrained. -
FIG. 5 shows an embodiment of a high-pressure pump 500 comprising a plurality of pressuredifferential devices 504 disposed within anelongated casing 510. Theelongated casing 510 may comprise a substantiallyhollow interior 515 formed along a central axis thereof. At least onepartition 520 may be axially fixed within theelongated casing 510 such that it divides thehollow interior 515. This may be accomplished, in various embodiments, by threading the at least onepartition 520 within thehollow interior 515 or inserting the at least onepartition 520 into thehollow interior 515 and then expanding an exterior surface thereof First and second pressure differential devices, 525 and 526 respectively, may be disposed on opposite sides of the at least onepartition 520. A firstrotary shaft 555 may extend through the first pressuredifferential device 525 and be axially fixed by the at least onepartition 520. The firstrotary shaft 555 may also be rotationally fixed with a secondrotary shaft 556 extending through the second pressuredifferential device 526. - In some embodiments, the first
rotary shaft 555 drives a first parallelrotary shaft 565 also extending through the first pressuredifferential device 525. The first parallelrotary shaft 565 may also be axially fixed by the at least onepartition 520 and rotationally fixed to a second parallelrotary shaft 566 extending through the second pressuredifferential device 526. - This configuration may be desirable because the overall pressure differential across the high-
pressure pump 500 is sustained by thecasing 510. Each rotary shaft only bears the pressure associated with its corresponding pressure differential device. This allows extremely high pressure differentials to be achieved, as thecasing 510 may be capable of withstanding higher pressures than any rotary shaft is able to withstand. -
FIG. 6 shows a magnified view of apartition 620 axially fixed within anelongated casing 610 of a high-pressure pump 600. A firstrotary shaft 655 may comprise at least oneappendage 658 protruding therefrom. The at least oneappendage 658 may be axially confined by the at least onepartition 620 aided by athrust bearing 659. - In some embodiments, the first
rotary shaft 655 drives a first parallelrotary shaft 665. The first parallelrotary shaft 665 may also comprise at least one appendage 668 that is axially confined by the at least onepartition 620 aided by athrust bearing 669. -
FIGS. 7 a and 7 b show embodiments of various shaft connection assemblies that may allow for rotational fixation without axial fixation. These types of connections may allow for torque to be transferred without transferring axial thrust. Specifically,FIG. 7 a shows first and second rotary shafts, 710 a and 720 a respectively, both comprising male spline ends that may mate with afemale spline coupling 730 a.FIG. 7 b shows a firstrotary shaft 710 b comprising a male spline end that may mate with a secondrotary shaft 720 b comprising a female spline end. -
FIG. 8 shows an embodiment of a high-pressure pump 800 comprising anelongated casing 810.Pressure transducers 890 may be disposed inholes 892 formed at various locations around theelongated casing 810 to allow for various pressure readings to be taken to monitor the pressures generated at different locations within the high-pressure pump 800. These pressure readings may be used to control the servomotor controlling the high-pressure pump. -
FIG. 9 shows an embodiment of a high-pressure pump 900 comprising anelongated casing 910 with lockingelements 990 extending there through toaxially fix partitions 920 disposed therein. - Whereas the present invention has been described in particular relation to the drawings attached hereto, it should be understood that other and further modifications apart from those shown or suggested herein, may be made within the scope and spirit of the present invention.
Claims (20)
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US14/188,805 US10578100B2 (en) | 2013-02-26 | 2014-02-25 | High-pressure pump for use in a high-pressure press |
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US201361769602P | 2013-02-26 | 2013-02-26 | |
US201361772757P | 2013-03-05 | 2013-03-05 | |
US14/188,805 US10578100B2 (en) | 2013-02-26 | 2014-02-25 | High-pressure pump for use in a high-pressure press |
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US20180163720A9 US20180163720A9 (en) | 2018-06-14 |
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US20220306052A1 (en) * | 2021-03-26 | 2022-09-29 | Schwintek Inc. | Modular leveling assembly for vehicle |
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US20180163720A9 (en) | 2018-06-14 |
US10578100B2 (en) | 2020-03-03 |
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